Memory alloy bone snap ring structure

Abstract

The utility model discloses a memory alloy bone clamping ring structure which comprises an annular body, a clamping opening is formed in one side of the annular body, the inner wall of the annular body protrudes and extends to form an anchor part, and a plurality of anti-skid teeth are formed in the positions, on the two sides of the clamping opening, of the inner wall of the annular body in a protruding and extending mode respectively. And a connecting line of the anchor part and the bayonet penetrates through the axis of the annular main body. The internal fixation device can be used for auxiliary internal fixation of tubular bones such as femur, tibia, ulna and radius, humerus and the like.

Description

Technical Field

[0001] The present application relates to orthopedic instruments, and in particular to a memory alloy bone clamp structure. Background Art

[0002] With the progress of society, the rapid development of industry and transportation, the incidence of fractures has also greatly increased. For long bone fractures of the upper and lower limbs, intramedullary nails are the preferred implants for treating fractures. For diseases such as hip joints, joint lesions, and necrosis, joint replacement prostheses are also the gold standard for their treatment.

[0003] However, for certain fracture types, when the joint prosthesis is displaced, stress concentration occurs in the intramedullary nail body, which can easily lead to split fractures of the tubular bone, thereby inducing complications such as wound infection and necrosis.

[0004] The application of memory alloy materials in orthopedic implants is a major innovation in internal fixation surgery. Utility Model Content

[0005] The utility model aims to provide a memory alloy bone clamp structure which can be used for auxiliary internal fixation of tubular bones such as femur, tibia, ulna, radius, humerus and the like.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0007] An embodiment of the present application discloses a memory alloy bone clip structure, comprising an annular body, a clip formed on one side of the annular body, an anchor portion protruding from the inner wall of the annular body, a plurality of anti-slip teeth arranged and protruding from the inner wall of the annular body on both sides of the clip, and a line connecting the anchor portion and the clip passes through the axis of the annular body.

[0008] Preferably, in the above-mentioned memory alloy bone clamp structure, the cross-section of the annular body is flat.

[0009] Preferably, in the above-mentioned memory alloy bone clamp structure, the protruding length of the anchor portion is slightly greater than the width of the annular body.

[0010] Preferably, in the above-mentioned memory alloy bone clamp structure, the length of the clamping opening is greater than the length of the anchor portion.

[0011] Preferably, in the above-mentioned memory alloy bone clamp structure, the axis of each of the anti-slip teeth passes through the axis center of the annular body.

[0012] Compared with the prior art, the utility model has the advantage of strengthening the holding force on the fracture fragments, and is used in conjunction with a locking intramedullary nail system and a joint prosthesis system to prevent long bone splitting fractures caused by stress concentration due to prosthesis settlement or deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 Shown is a schematic diagram of the memory alloy bone clamp structure in an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Combination Figure 1 The memory alloy bone clamp structure includes a ring body 100, a bayonet 101 is formed on one side of the ring body 100, an anchor portion 102 is formed on the inner wall of the ring body 100, and a plurality of anti-slip teeth 103 are arranged and protruded on both sides of the bayonet 101 on the inner wall of the ring body 100, and the connecting line between the anchor portion 102 and the bayonet 101 passes through the axis of the ring body 100. The cross section of the ring body 100 is flat. The protruding length of the anchor portion 102 is slightly greater than the width of the ring body 100. The length of the bayonet 101 is greater than the length of the anchor portion 102. The axis of each anti-slip tooth 103 passes through the axis of the ring body 100.

[0017] In this embodiment, the material is a temperature-controlled nickel-titanium memory alloy. The shape of the material has the property of changing with temperature, so it is also called a shape memory alloy.

[0018] The reason why shape memory alloys have deformation recovery ability is due to the thermoelastic martensitic phase transformation and reverse phase transformation that occur inside the material during deformation. There are two phases in shape memory alloys: high temperature phase-austenite phase, low temperature phase-martensite phase. Depending on different thermal / mechanical loads, shape memory alloys exhibit shape memory properties.

[0019] The structure of this technical solution is a flat ring structure with an open design on one side, accompanied by anti-slip teeth, and an anchor structure designed inside the ring to prevent displacement after surgery. According to the anatomical characteristics and size of the part to be used, it is divided into different models to meet the surgical needs of different parts. The nail tooth structure is designed at the open end to strengthen the holding force on the fracture fragment. The material will gradually soften in an ice water environment of 0℃-5℃, and professional surgical instruments are used to stretch and shape the product. In a warm water environment of about 40℃, the material can return to its original shape and strength to meet the need for pressurization of the fracture fragment.

[0020] The specific implantation method is as follows:

[0021] 1. Open the affected area and reposition the fracture;

[0022] 2. Measure the bone diameter with a ruler and select the appropriate bone clasp;

[0023] 3. Place the memory alloy bone clasp in sterile ice saline at 0℃-5℃ for about 1 minute to soften the material;

[0024] 4. Use the drill bit and drill guide to drill a hole at the fracture site, drilling through the unilateral cortical bone;

[0025] 5. Use the spreader to spread the two legs of the bone clamp opening;

[0026] 6. Align the bone clasp anchor with the pre-drilled hole and tap it gently with a bone hammer;

[0027] 7. Inject sterile warm saline at about 40°C into the bone clamp to restore the product to its original shape and achieve the effect of embracing and pressurizing to prevent secondary fractures;

[0028] 8. Suture the wound and complete the operation.

[0029] Implant Removal Procedure:

[0030] 1. Cut open the affected area and clean the callus around the implant;

[0031] 2. Inject sterile saline at about 0℃-5℃ into the affected area to soften it;

[0032] 3. Use a forceps to open the opening and remove the implant.

[0033] 4. Suture the wound and complete the operation.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A memory alloy bone clamp structure, characterized in that: The invention comprises an annular body, a bayonet is formed on one side of the annular body, an anchor portion is protruded from the inner wall of the annular body, a plurality of anti-slip teeth are arranged and protruded on the inner wall of the annular body on both sides of the bayonet, a line connecting the anchor portion and the bayonet passes through the axis of the annular body, the cross-section of the annular body is flat, the protruding length of the anchor portion is slightly greater than the width of the annular body, the length of the bayonet is greater than the length of the anchor portion, and the axis of each anti-slip tooth passes through the axis of the annular body.

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